Potatoes: Production, Marketing, And Programs For Developing CountriesInternational Potato Center, 23 thg 4, 1987 - 243 trang World patterns and trends in potato production and use; The potato crop and its physical environment; The socioeconomic environment: Levels of development and public policies; Supply, demand, and marketing; Potato nutrition and consuption; Potato production systems; Research priorities and potato programs; Impact of potato programs; Summing up. |
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Kết quả 1-5 trong 43
Trang 28
... soil type to another occur in the soil profile , plants may root as deep as 1 meter . The tuber is an enlarged portion of an underground stem adapted to storage of photosynthates and reproduction of the plant ( Fig . 5 ) . The tubers ...
... soil type to another occur in the soil profile , plants may root as deep as 1 meter . The tuber is an enlarged portion of an underground stem adapted to storage of photosynthates and reproduction of the plant ( Fig . 5 ) . The tubers ...
Trang 30
... liquids , provides good protection against microorganisms , and resists water loss . But if potatoes are grown in waterlogged soil , the lenticels of the tubers open wide , permitting easy entry of harmful. 30 The crop and its environment.
... liquids , provides good protection against microorganisms , and resists water loss . But if potatoes are grown in waterlogged soil , the lenticels of the tubers open wide , permitting easy entry of harmful. 30 The crop and its environment.
Trang 31
... soil , young tubers begin to grow at the tips of the stolons . Growth of the young tuber is the result of cell division and elongation and storage of translocated photosynthates within the cells . In order for tubers to enlarge - a ...
... soil , young tubers begin to grow at the tips of the stolons . Growth of the young tuber is the result of cell division and elongation and storage of translocated photosynthates within the cells . In order for tubers to enlarge - a ...
Trang 34
... soil for several years . The most important diseases transmitted by seed tubers are virus diseases . Preventing virus spread is the chief objective of seed potato certification . Viruses depress potato yields by reducing the amount of ...
... soil for several years . The most important diseases transmitted by seed tubers are virus diseases . Preventing virus spread is the chief objective of seed potato certification . Viruses depress potato yields by reducing the amount of ...
Trang 35
... soil , foliage and roots develop simultaneously and their growth is correlated . Tubers generally start growing slowly about 2 to 4 weeks after emergence and continue growing at a fairly steady rate . Early - maturing varieties have ...
... soil , foliage and roots develop simultaneously and their growth is correlated . Tubers generally start growing slowly about 2 to 4 weeks after emergence and continue growing at a fairly steady rate . Early - maturing varieties have ...
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Potatoes: Production, Marketing, And Programs For Developing Countries Douglas Horton Xem trước bị giới hạn - 2019 |
POTATOES: Production, Marketing, and Programs for Developing Countries DOUGLAS. HORTON Không có bản xem trước - 2019 |
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Africa agricultural agricultural research America areas average Bangladesh blight breeding capita Central cereals changes commodity consumers costs crop cultivation demand depends developing countries diseases early economic effect estimates Europe example expand farmers farms fertilizers field food crops growing grown growth harvest hectare higher highland impact important improved income increase India inputs insect institutions International Potato Center land late less levels Lima limited losses lower lowland major Mantaro Valley needs North percent period Peru pests plant policies population potato consumption potato crop potato prices potato production potato programs practices priorities problems processing projections rates reduce regions relative requirements research and extension resistance result rice root Rwanda season seed tubers selection soil South South Korea sprout storage stored supply Table temperate temperatures tons tropical usually varieties vegetable virus yields zones